Scopolamine Butylbromide for Donkeys: Colic Uses & Side Effects

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Scopolamine butylbromide, also called hyoscine butylbromide or sold as Buscopan, is an anticholinergic antispasmodic medication. In equine medicine, it is used to relax smooth muscle in the gastrointestinal tract and provide short-term relief from some forms of colic pain. In the United States, the FDA-approved equine product is labeled for intravenous use in horses only, so use in donkeys is typically extra-label and should be directed by your vet.

For donkeys, that distinction matters. Donkeys often show more subtle signs of abdominal pain than horses, and they can become seriously ill before obvious rolling or thrashing appears. Because this medication can briefly change heart rate and gut sounds, your vet will usually want to examine your donkey before giving it.

This drug is not a cure for colic. It does not fix an impaction, twist, displacement, or strangulating lesion. Instead, it is one tool your vet may use while sorting out the cause of abdominal pain and deciding whether conservative care, medical treatment, or referral is the best next step.

In equine practice, scopolamine butylbromide is used for short-term control of abdominal pain associated with spasmodic colic, flatulent colic, and simple impactions. Its effect is fast but brief. That makes it most useful when your vet suspects intestinal spasm or gas-related discomfort and wants to reduce pain while continuing the colic workup.

Your vet may also use it to relax the rectum and make a rectal examination easier and safer. That can help with diagnosis, especially when your donkey is tense or painful. In many cases, it is paired with other treatments such as fluids, walking guidance, stomach tubing, or an anti-inflammatory chosen by your vet.

Because donkeys can hide pain, medication should never replace a full assessment. A donkey that seems only mildly quiet, off feed, or isolated from companions may still have a significant problem. If colic signs return after the drug wears off, or if your donkey becomes more depressed, bloated, or uncomfortable, your vet needs to know right away.

Only your vet should determine the dose for a donkey. The FDA-approved horse label for Buscopan is 0.3 mg/kg IV once, which equals 1.5 mL per 100 kg of body weight using the 20 mg/mL injectable solution. Donkeys are often dosed using equine references, but species differences, body condition, hydration status, and the suspected cause of colic all matter.

This medication is typically given intravenously by your vet. It is not a routine at-home medication for pet parents. After administration, the pain-relieving and spasm-reducing effect is usually short-lived, and your vet will reassess heart rate, gut sounds, comfort, manure output, and hydration.

Do not guess your donkey's weight or reuse leftover medication from another animal. A donkey with colic may need very different care depending on whether the problem is gas, spasm, impaction, gastric reflux, enteritis, or a surgical lesion. If your donkey is dull, stops eating, lies down more than usual, or seems "not quite right," see your vet promptly rather than waiting for dramatic signs.

The most expected side effects are related to the drug's anticholinergic action. These can include a temporary increase in heart rate, reduced gut sounds, dry mouth, and pupil dilation. In horses, the heart rate increase is usually most noticeable in the first 5 to 15 minutes and often settles by about 30 minutes. Reduced intestinal sounds are also expected for a short period.

That is why your vet usually wants baseline vital signs before treatment. If heart rate and borborygmi are checked only after the drug is given, the exam can be harder to interpret. In overdose studies in horses, fixed dilated pupils, dry oral mucosa, and temporary absence of gut sounds were seen, with recovery over hours.

Call your vet immediately if your donkey becomes more painful, more bloated, very weak, severely depressed, or stops passing manure. Also contact your vet if signs improve briefly and then return. In donkeys, worsening depression or reduced appetite can be especially important because they are prone to hyperlipemia when they stop eating.

Scopolamine butylbromide can have additive anticholinergic effects when combined with other drugs in the same general category. Depending on the case, your vet may be more cautious if your donkey is also receiving medications that can increase heart rate, reduce gut motility, or contribute to dry mucous membranes and urinary retention.

In colic cases, this drug is often used alongside other therapies, but timing matters. Because it can temporarily raise heart rate and decrease gut sounds, it may complicate interpretation of the physical exam if given too early. Your vet may prefer to complete key parts of the exam first, then medicate.

Be sure your vet knows about all medications and supplements your donkey has received recently, including flunixin, phenylbutazone, sedatives, dewormers, ulcer medications, and any over-the-counter products. Never combine colic medications on your own. What helps one donkey with mild spasm could delay diagnosis in another donkey with a more serious obstruction.